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Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract]                      
Sales $ 296,644 $ 439,101 $ 782,543 $ 488,270 $ 236,551 $ 283,100 $ 604,115 $ 373,320 $ 2,006,558 $ 1,497,086 $ 1,467,458
Gross profit for product, installation and service 47,224 77,305 220,073 139,628 49,491 70,091 226,202 131,870 484,230 477,654  
Operating income (loss) (67,920) (11,496) 117,245 22,624 (30,517) (13,764) 119,695 54,786 60,453 130,200 92,968
Income (loss) before income taxes (71,227) (14,353) 114,279 20,327 (32,629) (15,963) 117,316 52,688 49,026 121,412 76,543
Net income (loss) (49,993) (10,587) 81,379 14,489 (23,233) (12,054) 85,164 37,860 35,288 87,737 55,918
Limited Partners’ interest in net income $ (49,548) $ (10,494) $ 80,682 $ 14,367 $ (23,043) $ (11,956) $ 84,483 $ 37,564 $ 35,007 $ 87,048 $ 55,541
Net income (loss) per Limited Partner unit:                      
Basic and diluted income per Limited Partner Unit: $ (1.36) [1] $ (0.29) [1] $ 1.75 [1] $ 0.32 [1] $ (0.58) [1] $ (0.30) [1] $ 1.71 [1] $ 0.74 [1] $ 0.85 [1],[2] $ 1.82 [1],[2] $ 1.07 [2]
[1] The sum of the quarters do not add-up to the total due to the weighting of Limited Partner Units outstanding, rounding or the theoretical effects of FASB ASC 260-10-45-60 to Master Limited Partners earnings per unit.
[2] See Note 19 - Earnings Per Limited Partner Units.